1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccdfd06b89b7197b426b673f18bc99ecf7d61ae1d7ed6828355e64a306d9cde. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c46b067-8f6a-4b84-8907-3307f0b6e8bb.json and https://artists.proofprofile.net/proofs/artist/3c46b067-8f6a-4b84-8907-3307f0b6e8bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5681e670837abb7f6555bd6d0102833e0b564e47ac99e000e9de7f3ee1c083e6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACK1526253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a86e1ed72ce0685789b00d894297ec089f2737d43e47bc13005decf9892f509. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACK1526292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa54dc36b7c68c42a9c5701b6b858bd3dbfb6729a8ab3f0b01bb37ede8317d13. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAIC2425089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6555248a36892e559a2f8d312ee80fbc53660dad395efa438f840bc3b2ce6b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHK2315250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4926ff64247d01d4a8495a186eff6ae2d40a3a23f60d60f9fa4fa960c9ee25cb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGU2394278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9359259629c950f51eb83edf4c1bf689aa2baf0d1295cd75f284a4977cef5c83. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGT2366214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2400f2210e1a3c10cba1d7af7fc76ff127664ef4004f782368fba9f1fe6474cf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGT2366221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0727ebe0e22adc2f0da12356e6ec647eb498bb843bef41ce5e6342504d14a757. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGS2381032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb0b9f217fad87890d5714431ccc92cbf583869572798fa0cc5b0310fd69dc7. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2267071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c285b74118707a20205b60481722a8769c1e2c39f42962c073e2f342ccb8138. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBKQU2057203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82025c5430ee49cb960b1633084508ed52a13f2412fc017646cb4d8dfa3016ad. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCADI1701856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9b2d5b67a706f1678ab7d4fed8c91a5aedc9e3d73f704bf3dd8c454d2f805c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCADD1748083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb0148bb8b668eb2dd94b0eb6bbd677e099d1a699a762cd219adfd45817a077. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACK1540415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84aa2c4ab35d82233cf16a3ec14441e5854cd24826c477c986667ce8abfaf5d9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACK1536020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd0442345f5eb9a62813c4dba11292e0fb09c927942fb0d1058100cc591c81. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCACJ1563969.